Metallocene compounds, ligands used in their preparation,...

Details Metallocene compounds, ligands used in their preparation,... Metallocene compounds, ligands used in their preparation,...

2011-08-23

2011-08-23

Jagannathan, Vasu (Department: 1764)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S170000, C526S172000, C526S183000, C526S192000, C526S194000, C526S222000, C526S348000, C502S152000, C502S155000, C502S158000, C502S168000, C502S219000, C502S227000, C502S232000

Reexamination Certificate

active

08003743

ABSTRACT:
A process for preparing 1-butene polymers comprising polymerizing 1-butene and optionally ethylene, propylene or higher alpha-olefin, in the presence of a catalyst system obtainable by contacting:a) metallocene compound of formula (I):wherein: M is a transition metal; p is an integer from 0 to 3; X, same or different, is a hydrogen atom, a halogen atom, or a hydrocarbon group; L is a divalent C1-C40hydrocarbon radical; R1is a C1-C40hydrocarbon radical; T1, is a moiety of formula (IIa) or (IIb):wherein R2and R3, are C1-C40hydrocarbon radicals or they can form together a C3-C7-membered ring; R4is C1-C40hydrocarbon radicals; T2and T3, are a moiety of formula (IIIa) or (IIIb):wherein R6and R7, equal to or different from each other, are hydrogen atoms or C1-C40hydrocarbon radicals; R5is a hydrogen atom or a C1-C40hydrocarbon radicals; with the proviso that if T1is a moiety of formula (IIa) at least one between T2and T3is a moiety of formula (IIIb), and if T1is a moiety of formula (IIb) at least one between T2and T3is a moiety of formula (IIIa); andb) at least an alumoxane or a compound able to form an alkylmetallocene cation.

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L. Resconi et al., “1-Olefin Polymerization at Bis(pentamethylcyclopentadienyl)zirconium and -hafnium Centers: Enantioface Selectivity,”Macromolecules, vol. 25(25), p. 6814-6817 (1992).

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